Both the Estate Richmond Power Plant on St. Croix and the Randolph Harley Power Plant on St. Thomas experienced tripped generating units on Monday triggering electric service interruptions in both island districts.
Eight electrical feeders on St. Croix fell off line around 10:45 a.m., affecting more than 15,000 customers when Unit 17 tripped. Plant personnel brought Unit 20 on line and once the power plant was stabilized, service was restored to all customers. All feeders were back on line by 12:11 p.m. according to the V.I. Water and Power Authority.
Later in the afternoon on St. Thomas, at about 2:34 pm, Unit 18 tripped causing nine feeders to fall off line affecting service to just over 16,000 customers. Two feeders were restored initially and once Unit 25 wrapped up its scheduled maintenance and was added to the dispatch, all feeders were returned to service, according to WAPA. Power was fully restored around 4:30 p.m. with three other units power powering the St. Thomas St. John district.
Other units were unavailable for use Monday. Unit 23 is preparing to undergo maintenance overhaul and conversion to LPG; Unit 14 is sidelined awaiting a replacement part and Unit 18 will remain offline until personnel identify the factors which contributed to the unit tripping Monday afternoon. On St. Croix, plant personnel will troubleshoot the cause of Unit 17 falling off line Monday morning, according to WAPA officials.